Place the letters A, B and C in the grid. The letters on the edge are informations about the arrangement of the row or column. Repeated letters are given only as single letters. If a line is AABBA , then, for example, ABA is at the edge. The question marks indicate that we do not know which letter is at this place.

Fill the cells (big circles) of the grid with the numbers 1 though 9. On no straight line (with 2 - 9 cells) there can be any number repeated.

If there is between neighboured cells a line with a white dot, then the difference between the numbers in these cells is 1. If there is between neighboured cells a line with a black dot, then one number is the half from the other. The dot between two cells with 1 and 2 can have any of these two colors.

If there is a line without a small dot between two cells then neither the difference is 1 nor one cell is the half of the other.

Divide the grid into areas of 4 cells and fill the cells with the numbers 1 through 4 such that each if you read from the top to the bottom and from the left to the right in each area is each number and these numbers have the order 1 - 2 - 3 - 4.

Divide the grid into areas of 4 cells and fill the cells with the numbers 1 through 4 such that each if you read from the top to the bottom and from the left to the right in each area is each number and these numbers have the order 1 - 2 - 3 - 4.

Divide the grid into areas of 4 cells and fill the cells with the numbers 1 through 4 such that each if you read from the top to the bottom and from the left to the right in each area is each number and these numbers have the order 1 - 2 - 3 - 4.